Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/4504#discussion_r25232681
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/Tokenizer.scala
---
@@ -39,3 +39,66 @@ class Tokenizer extends UnaryTransformer[String,
Seq[String], Tokenizer] {
override protected def outputDataType: DataType = new
ArrayType(StringType, false)
}
+
+
+/**
+ * :: AlphaComponent ::
+ * A regex based tokenizer that extracts tokens using a regex.
--- End diff --
From the doc, it is not clear to me whether I should specify groups to
extract in the regex or it repeatedly matches the entire regex.
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